| simultaneous | Existing or occurring at the same time: coincident, concurrent. (18 Nov 1997) |
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| simultaneous contrast | The enhancement of the visual sensation of white when a white object is viewed adjacent to a black object; the black object also appears blacker as a result of the contiguity of white. Adjacent complementary colours also appear brighter; e.g., green appears a brighter green and red a brighter red if these two colours are viewed side by side. (05 Mar 2000) |
| simultaneous hermaphrodite | A type of hermaphrodite which has both male and female organs at the same time and is able to produce both sperm and eggs at the same time. Such an organism is also able to fertilize its eggs with its own sperm (self-fertilization). (09 Oct 1997) |
| simultaneous perception | A combination of two slightly dissimilar images into a single image. (05 Mar 2000) |